<div style="font-size: 120%">
    <h3>算数练习&nbsp;&nbsp;学生：{{student.username}}</h3>

   <!-- <div ng-repeat="exercise in exercises">
        {{exercise[0]}} {{exercise[1]}} {{exercise[2]}} = {{exercise[3]}}
    </div>
      html空格收缩
      number(Str)
      parseInt(str)
      ng-disabled="style.disabled"

    -->
    <form role="form" ng-submit="submitExerciseResult()">
        <div ng-repeat="exercise in exercises">
          {{exercise[0]}} {{exercise[1]}} {{exercise[2]}} =
            <input type="number" id="exerciseAnswer{{$index}}" ng-model="exercise[5]" value="" required>
          <span style="visibility: {{style.showAnswer}}">结果：{{exercise[6]}} 答案： {{exercise[3]}}</span>
        </div>
        <button>提交答案</button>
        <button ng-click="returnMainPage()">返回个人主页</button>
    </form>

</div>